We have completed maintenance on DiscoverMagazine.com and action may be required on your account. Learn More

The Discovery of TDP 43 Dementia and How It Strikes the Oldest Ages

TDP 43 Dementia is a neurological disorder characterized by the abnormal accumulation of protein in the brain. Learn how it was discovered.

By Linda Marsa
Dec 23, 2019 10:00 PMAug 10, 2023 2:04 PM
Dementia Neuropathologist, Peter-Nelson
Neuropathologist Peter Nelson analyzed dementia patients’ brains postmortem. (Credit: Mark Cornelison)

Newsletter

Sign up for our email newsletter for the latest science news
 

So many older people experience the tell-tale symptoms of Alzheimer’s disease, like forgetfulness and muddled thinking. Yet post-mortem autopsies often find none of the amyloid plaques or tau tangles that are hallmarks of the mind-robbing illness.

Now, scientists may have solved this perplexing mystery: These patients are probably affected by a newly identified degenerative disorder that mimics Alzheimer’s and could be just as prevalent among older adults.

LATE Dementia

Called LATE (limbic-predominant age-related TDP-43 encephalopathy), it mainly affects the “oldest old” — generally people older than 85. It also seems to be associated with deposits of an errant version of a protein called TDP-43 that collect in brain regions governing memory, like the hippocampus and middle frontal gyrus, as well as areas that regulate emotions and survival instincts, like the amygdala.

Roughly one in four people older than 85 have a buildup of this protein in these sections of the brain, suggesting the disorder may be as much of a public health threat in this age group as Alzheimer’s.


Read More: The 4 Main Types of Dementia


Accumulations of Abnormal Protein

Over the past decade, scientists noticed about a third of neuroimaging scans and cerebrospinal fluid analyses on living patients with memory problems came back negative for Alzheimer’s.

Instead of the expected tau or amyloid deposits, “we’d look under the microscope and there was some other protein that was accumulating,” says Julie Schneider, associate director of Rush University Medical Center’s Alzheimer’s Disease Center in Chicago.

A postmortem analysis of a dementia patient's brain. (Credit: Mark Cornelison)

Slowly, the puzzle pieces started falling into place. This appeared to be a different illness. “We all had clues and noticed different bits and pieces, but no one had a complete picture,” says Peter Nelson, a neuropathologist specializing in dementia-related research, including Alzheimer’s, at the University of Kentucky.


Read More: How to Diagnose Dementia: Can You Get Tested for Dementia?


Identifying TDP 43 Dementia

Finally, in a paper published in the journal Brain in April, scientists from numerous disciplines gathered everything they knew about this disorder to create a resource that could be used as a foundation for further research.

They agreed upon the name LATE, and described symptoms and the affected brain regions. They also fingered the probable culprit — the errant TDP-43. In addition, they suggested diagnostic tools and strategies for targeted therapies that could thwart the abnormal protein.

“The more we understand,” says Nina Silverberg, director of the Alzheimer’s Disease Research Centers Program at the National Institute on Aging, “the better hope we have of finding a treatment.”


Read More: How to Treat Dementia No Matter What Age You Are

1 free article left
Want More? Get unlimited access for as low as $1.99/month

Already a subscriber?

Register or Log In

1 free articleSubscribe
Discover Magazine Logo
Want more?

Keep reading for as low as $1.99!

Subscribe

Already a subscriber?

Register or Log In

More From Discover
Recommendations From Our Store
Shop Now
Stay Curious
Join
Our List

Sign up for our weekly science updates.

 
Subscribe
To The Magazine

Save up to 40% off the cover price when you subscribe to Discover magazine.

Copyright © 2024 Kalmbach Media Co.